Koi and goldfish have certain similarities, so they are sometimes not easy to distinguish. However, in terms of categories, the two are different. Although both of them are artificial varieties, koi is a variety of carp, while goldfish is a variety of crucian carp.
1. Tail: The difference between the two tails is relatively large. Koi's tail is generally single-tailed, and some are double-tailed; While goldfish are generally two-tailed, some variations of goldfish are three-tailed or four-tailed. The difference between the two in the tail can be said to be the most obvious difference, which is relatively easy to observe.
2. Length: The length difference between koi and goldfish is also relatively large. Generally speaking, Koi are relatively long, and some of the longer Koi can even reach more than 1 meter. Generally speaking, the body of goldfish is relatively short, and even rarely more than 20 centimeters.
3. Beards: To tell whether it is a koi or a goldfish, you can tell it from whether they have beards. The mouth of a koi fish is bearded, while the mouth of a goldfish is not.
4. Volume: The length of koi and goldfish is different, so their volume is also quite different. Koi is not only a relatively long fish, but also a relatively large ornamental fish. The body of the goldfish is relatively small, is a small ornamental fish.
